Re: [time-nuts] DCF77 Analyzer/Clock

rel/NTPns.20080902.tgz -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___

Re: [time-nuts] PLL Digital Loop Filter

In message , James Peroulas writes: >I've found plenty of texts describing analog loop filters. Are there any >recommendations for digital loop filter PLL design? This may help: http://phk.freebsd.dk/time/20141018.html -- Poul-Henning Kamp | UNIX since Zilo

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

they cannot possibly have accepted if they didn't need it. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. __

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

k, because you don't have continuous operation. You could build one with two beams running opposite directions and still using the same laser light and RF field, but it would be more complicated. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP s

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

. Why would they ? They had a pretty good gig going with no competition... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be

Re: [time-nuts] Antique precision timing device without electronics

k through the shield so that it matters? How well does >coax work at low frequencies? Coax is near perfect at low frequencies, but the lengths of these cables introduced geophysics as a number of sources of noise. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org

Re: [time-nuts] Antique precision timing device without, > electronics

In message <338b9eed-8664-3876-afdf-610abc420...@irtelemetrics.com>, Dan Kemppainen writes: >What the lowest frequency tuning fork oscillator ever built? Was 1Hz >ever achieved commercially? Does flagpoles count ? :-) -- Poul-Henning Kamp | UNIX since Zilog

Re: [time-nuts] Antique precision timing device without electronics

seems that people didn't really expect that, because it took a couple of years to build terminal equipment which could exploit all that bandwidth: https://archive.org/details/bstj7-2-225 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP s

Re: [time-nuts] Antique precision timing device without electronics

tuning fork. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mai

Re: [time-nuts] RFDO - Experience and questions

to something useful like 100 KHz 5 MHz or 10 MHz??. You use clock an ADC from 1MHz derived from your reference, and then you demodulate and decode TDF in software on the microcontroller attached to the ADC. Get with the times, guys... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...

Re: [time-nuts] Coming to a drive-way near you: Optical Lattice clocks

all a ton of good VRLA lead acids, install suitable telemetry and hand it over the MAERSK, with a manifest which says "near metacenter, power critical" ? Wouldn't be that expensive, and you'd know it is pretty close to MSL all along. -- Poul-Henning Kamp | UNIX since Zi

[time-nuts] Coming to a drive-way near you: Optical Lattice clocks

Have we talked about this yet ? https://arxiv.org/abs/1609.06183 https://arxiv.org/abs/1607.03731 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can

Re: [time-nuts] HP5065A Rubidium question

-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] Have done some more cutting on the Cs beam tube

allel to the beam-path is much more likely to be the degaussing coil. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by

Re: [time-nuts] Line Frequency standard change - Possible ?

hat but with capacitors rather than batteries. I belive Germany has started to change regulations so future solar farms will have to offer both VA and W to the grid, but I don't know the exact details. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP sinc

Re: [time-nuts] Line Frequency standard change - Possible ?

In message <006a1c6a-0b2f-16fd-5fef-64352ff14...@earthlink.net>, jimlux writes: >On 2/9/17 4:03 PM, Poul-Henning Kamp wrote: >> >> In message <63beea7a-f9fc-6e1d-b855-2c7056de3...@earthlink.net>, jimlux >> writes: >> >>> I thin

Re: [time-nuts] Neoprene rubber drops GPS multipath signals to zero

le about other things you can do with such materials: https://archive.org/details/bstj27-1-58 Poul-Henning [1] If you arrange for the imperance to ramp from open to short you have a "stealth material". -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.

Re: [time-nuts] Line Frequency standard change - Possible ?

In message <9fd9beca-832a-4c38-9799-4a31625f7...@n1k.org>, Bob Camp writes: >Not an easy thing. Not even close, which is precisely why the "50/60 Hz or bust" mindset doesn't work any longer. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@free

Re: [time-nuts] The USFS Frequency Standard...

WWV. On a BBB you could even add a FRI length buffer also, to receive the Wildwood Loran-C. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can

Re: [time-nuts] Line Frequency standard change - Possible ?

eeping things nice and stable is much easier with a load which converges on your target parameters, than with a load which diverges from it. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Ne

Re: [time-nuts] Line Frequency standard change - Possible ?

o slow down the >transient. Yes, it slows down the front flank, on the other hand, once you get the arc going, with DC that L really keeps it going for a long time. The difference in practice is that a HVAC short leaves a burn-mark on the metal parts, HVDC solidly welds them together if it doe

Re: [time-nuts] Line Frequency standard change - Possible ?

back enough C14 to be trouble over the lifetime of the devices. According to people in the HVDC electronics (if you can call it that) business, we can build any of the devices we need from current high purity semiconductors, but the costs need to come down. -- Poul-Henning Kamp | UNIX since Z

Re: [time-nuts] Line Frequency standard change - Possible ?

In message , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: >On 9 February 2017 at 21:31, Poul-Henning Kamp wrote: > >> >> The only other possible "balance signal" is the voltage, and it >> suffers from a host of noise mechanisms, f

Re: [time-nuts] Line Frequency standard change - Possible ?

ecause you suddenly have to run the current both ways in the same half-cycle. Nobody wants to pay for that voluntarily, and nobody are particular keen to cause the first explosion/fire while they get the control-law debugged. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd

Re: [time-nuts] Line Frequency standard change - Possible ?

eats HVAC big time on long connections, and it is only a matter of getting semiconductors into shape before that happens. That however, is by no means a trivial task: It's all about silicon purity. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since

Re: [time-nuts] Sub-ps delay line

length of coax in an adjustable oven ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explaine

Re: [time-nuts] WWV Receivers

y-check on your GPS receivers. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Re: [time-nuts] information about the Austron Synchronous Filter 2090A

In message , Ruslan Nabioullin writes: >On 02/05/2017 02:58 AM, Poul-Henning Kamp wrote: >> I belive [sic] the idea is that if you have two Loran-C receivers >> tracking two different GRIs, the 2090A can blank out the strongest >> stations [sic] pulses for t

Re: [time-nuts] information about the Austron Synchronous Filter 2090A

strongest stations pulses for the weaker chains receiver. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by inc

Re: [time-nuts] eLoran test 6 Feb for almost 2 months

I is an integral multiple of 1 millisecond, which means that you cannot average out CW signals on integral kHz frequencies. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to

Re: [time-nuts] eLoran test 6 Feb for almost 2 months

cular: http://phk.freebsd.dk/loran-c/theoretical_spectrum/ Newer stuff here: http://phk.freebsd.dk/AducLoran/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can a

Re: [time-nuts] eLoran test 6 Feb for almost 2 months

peared into my archives some time go... Stick to the zero-crossings. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained b

Re: [time-nuts] eLoran test 6 Feb for almost 2 months

really good antenna signal and a scope/spec-an with high X-resolution, you can halve the sync frequency and, so that the pulse polarity does not cancel out about half the loran pulses. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBS

Re: [time-nuts] purpose of time of day display units

;m guessing). I can imagine two reasons: A) Trying to explain a $1M set of racks keeping track of time, without them actually showing the time is a lot harder. B) Visual indication that your IRIG-B is fine. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org |

Re: [time-nuts] OT: Eagle PC CAD now Autodesk, $500/year

In message , "Richard (Rick ) Karlquist" writes: >Still, the question arises: are there any affordable alternatives? KiCad! Open source, and actively maintained and developed by CERN. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP

Re: [time-nuts] hm H Maser

d would be both much more feasible and much more worth it. Heck, just getting an optical comb working would be awesome... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to

Re: [time-nuts] hm H Maser

g for TECs. You'll need very competent mixing (I hope your wife likes the look of the Pompidou center) and even more competent measurement and regulation. Building-in-building-in-existing-barn is probably the cheapest you can do this, and the maser is certainly going to be cheaper. -- Poul-Hen

Re: [time-nuts] HP 5372A channel c option 030

d a key, jumper, or memory >setting. According to the service manual, the upgrade kit contains: 05372-60020 C-Channel Board 05372-60224 Front panel cable (semi-rigid) [8 more lines of mechanics and cables] -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.2

Re: [time-nuts] EFOS Maser turns 34!

ld you servo that via the cavity temperature ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by

Re: [time-nuts] Line Voltage - USA

ck popped around, cut power to the local area, and dropped a couple of volts on the transformer, turned power on again and the problem was fixed. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-taho

Re: [time-nuts] Line Voltage - USA

In message , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: >On 2 January 2017 at 18:14, Poul-Henning Kamp wrote: >> Take the average of the two, and use the low max and high min as limits >> >> QED: 230V +/- 6% = [216..244] >> > >Do y

Re: [time-nuts] Line Voltage - USA

240V +/- 10% = [216..264] V Take the average of the two, and use the low max and high min as limits QED: 230V +/- 6% = [216..244] -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never a

Re: [time-nuts] Line Voltage - USA

not available, by providing neutral from "outside" the RCD as PG in the installation. You'll still be (horribly!) exposed of an accident in the distribution grid (or lightning!) fires up the neutral, but that's simply life - or death - without a grounding rod. -- Poul-Henning Kamp

Re: [time-nuts] Totally unrelated, but..

r the regulators input has a resonance frequency... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained

Re: [time-nuts] Totally unrelated, but..

tention to specs on some linear regulators, they are unstable in the weirdest places in the loadmap. For instance, many regulators really want a specific minimum load, and if you don't for just a nanosecond, they'll do a hissy fit. A shunt resistor to ground often solves that, at the

Re: [time-nuts] Switching regulator replacement for 7805

orm nicely in all applications where I have plugged them in. Havn't tried an OCXO though. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be exp

Re: [time-nuts] Google public NTP service

ts a lot of things nobody should ever be at the receiving end of. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequat

Re: [time-nuts] Google public NTP service

In message <20161130123506.63853...@spidey.rellim.com>, "Gary E. Miller" writes : >Not true. NTP has provision for arbitrrary extensions to an ntp packet. Good luck getting that through firewalls after the lastest rounds of NTP amplification attacks... --

Re: [time-nuts] Google public NTP service

TP list :) > >The gotcha is that there is essentially zero time to approve and implement >something like that before the end of next month … And no space in the NTP packets for the bits. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC

Re: [time-nuts] Google public NTP service

In message <706C789A8B5440B3911A8A02C93E3E54@Alta>, "David J Taylor" writes: >Hope it doesn't mess up too many folk. It's completely against the >recommendations, of course. But in difference from these, it actually works. Trust me, they'll get th

Re: [time-nuts] Do reflections up/down the antenna cable cause a problem with GPS?

e, which is typically 50 +/- 2 >Ohms, but this varies, not only between different makes/models of cables, I think the installation manual for Trimbles timing products say you can use either 75 or 50 Ohm cable... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | T

Re: [time-nuts] How phase stable is rg59 or alternate coax

In message , Scott Stobbe writes: >If you had 30 ft of rg59 outdoors seeing maybe 10 degC swings everyday, >would the propagation time be stable to ps? ns? ps ? No way - *ever* ns ? Probably, but it depends a lot on the exact materials and manufacturing. -- Poul-Hennin

Re: [time-nuts] How can I measure GPS Antenna quality?

very careful to space the antennas exactly 300mm apart, but that didn't inspire them to align in any way. In all fairness, those were "timing" receivers so nobody cared where their phase-center was during production... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@f

Re: [time-nuts] Swagelok and metric tubing question

through almost all metals. (See also: https://en.wikipedia.org/wiki/Hydrogen_embrittlement) The canonical filter method for hydrogen is to press it through a "filter" which is a of solid slab of Palladium. Helium is almost as bad, but is better in leak-checks because it is non-reactive.

Re: [time-nuts] Fluke Voltage Standards.

s. There is, it's called a Josephson Junction. I think volt-nuts recently concluded that prices start from about $50k... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attri

Re: [time-nuts] Thinking outside the box a super reference

hive_19730017775 > >https://archive.org/details/NASA_NTRS_Archive_19750006044 Interesting! As is this: https://arxiv.org/abs/physics/0508227 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since

Re: [time-nuts] Thinking outside the box a super reference

he alkali atoms have been poked and prodded to no end about this, in the hope of creating active Cs, Rb or Sr frequency standards, but the very reluctant (and expensive) conclusion was that hydrogen is the only one in the family which knows the trick. -- Poul-Henning Kamp | UNIX since Zilog Z

Re: [time-nuts] Thinking outside the box a super reference

er exactly >the story) but the bottom line was that they determined >it was because of helium contamination. How would helium make his clocks noisy ? Isn't it more likely that it was the alphas from the radon decay that did it by their charge ? -- Poul-Henning Kamp | UNIX since Zilog

Re: [time-nuts] Thinking outside the box a super reference

pe with a 40 billion years half-life. 1 to 2 months is a LNG time for photographic film. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be

Re: [time-nuts] Thinking outside the box a super reference

n fact that just causes the same exact problems as the tuned cavity anyway, as long as we can measure the frequency well enough. (No, I havn't done the math on this, my wife has banned me from starting any new projects until our house is finished.) -- Poul-Henning Kamp | UNIX sinc

Re: [time-nuts] Thinking outside the box a super reference

the heck of it, I'd go laser instead of the old UHF lamp. With respect to precision machining, that space has changed a lot over the last five years, with precision CNC machines, factory or home-built, dropping dramatically in price. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

Re: [time-nuts] Old C tube behaviors thought

ant. It is btw, one of the points where it must have become a LOT easier to build a beamstandard at home, in this case thanks to Nb magnets. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-taho

Re: [time-nuts] Cs tube pics

lly excite a solid crystal. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Re: [time-nuts] Cs tube pics

cdn-images-1.medium.com/max/800/1*A1Qt9uU3lRmzfx_5O_QkgA.png) Cesiums are a lot like that. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequa

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

while it was running ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. __

Re: [time-nuts] So what’s inside that Cs Beam Tube anyway?

#x27;re keepers. I think they there to contain any metalic dust or particles from the act of screwing the screw in. >My really dumb question is, why isn't there Cs plated on everything? Because Cs is incredibly reactive and sticks to the strategically placed getters. -- Poul-Henning Kamp

Re: [time-nuts] Temp/Humidity control systems?

d 80 m of waveguide. 100 mm or so would be sufficient. Then it would require a quite high frequency... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what c

Re: [time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

? If you want _really_ low noise the TYL/TVL is there, but have restricted input-range. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be exp

Re: [time-nuts] Temp/Humidity control systems?

In message , "Dr. David K irkby (Kirkby Microwave Ltd)" writes: > [...] so it might be a relatively cheap way to measure humidity. 80m wave-guide is neither cheap, nor in most circumstances, practical :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p..

Re: [time-nuts] Temp/Humidity control systems?

o run liquid through, but unless you are *really* dedicated, don't start digging just for constant temperature. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice wh

Re: [time-nuts] WWV receivers?

misses and interrupts. > >Should not be too high. It should be nonexistent. The sensible way to do SDR-timing, is to capture a signal from the disciplined oscillator with the ADC samples, so that their precise timing relationship is firmly bolted down. -- Poul-Henning Kamp | UNIX since

Re: [time-nuts] Opening an Isotemp OCXO

In message <10a3ea7d-37f0-51bc-2470-35645d767...@comcast.net>, Peter Reilley writes: >The chip is run off 12 volts so it must be CMOS. Or the OCXO is not a 12V model ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 95

Re: [time-nuts] Temp/Humidity control systems?

re comparatively slow, last I saw one it could only do a measurement every second minute. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can

Re: [time-nuts] Temp/Humidity control systems?

-cave - I think it would work great - cheap >airconditioner, large thermal mass buffer, well stirred air. Absolutely. But the problem in the basement setting is that the heat ends up in your basement, which means the air can hold more moisture, which you really do not want. -- Poul-He

Re: [time-nuts] Temp/Humidity control systems?

manage the humidity in it separately from the rest of the basement. PS: Here is a good webcalculator: http://go.vaisala.com/humiditycalculator/5.0/ -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD s

Re: [time-nuts] Temp/Humidity control systems?

t 1.2 >meter wide, 2 meters tall and 60 cm deep, filled with 100 or so 750 ml >bottles of liquid. You can do *much* better with an old fridge and a small waterpump to circulate water in the cooling loop. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TC

Re: [time-nuts] Temp/Humidity control systems?

ame temperture, wetter air is lighter than dryer air. * The temperature is never the same. * Condensation should be avoided, period. * You cannot "feel" absolute humidity, always measure it. And yes, go ahead and look up number two, it's true. Dehumidifiers belong on shelves under

Re: [time-nuts] Temp/Humidity control systems?

both thermal mass and inertia (= heat capacity and heat impedance) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be expl

Re: [time-nuts] Temp/Humidity control systems?

In message , "William H. Fite" writes: >Rick, professional environmental chambers [...] And they come up on fleabay with surprising regularity. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer

Re: [time-nuts] Temp/Humidity control systems?

le while you play with other stuff. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Re: [time-nuts] WWV receivers?

n I made one in college. We have CPUs and sounds-cards these days... Also: The KiwiSDR is nearly perfect hardware, no matter which VLF/HF station you want: You can track GPS and four (possibly 8) VLF/HF stations at the same time. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p

Re: [time-nuts] PC clock generator without 14.318MHz

https://en.wikipedia.org/wiki/Colorburst#Rationale_for_NTSC_Color_burst_frequency -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___

Re: [time-nuts] New PPB rated TCXO

like a charm. I take it they know how to price a gem like that ? Any ball-park numbers for us ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately

Re: [time-nuts] TimeLab

e 2Hz ambiguity, which admittedly is easier. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be exp

Re: [time-nuts] Prologix USB-GPIB Controller

_massive_ and very efficient recycling of electronic components from all the E-Junk we send down there. And for voltage references, "pre-owned" is likely to mean "better". -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 Free

Re: [time-nuts] TimeLab

PPSDIV gives nice symmetrical PPS, just trigger opposite flank. [2] Obviously: Do not use a computer running a weather model for this -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribu

Re: [time-nuts] ADC sample voting algorithm?

ise: Always the median. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

In message , Bryan _ writes: >May find this old video interesting. >https://youtu.be/Iy23Us3nrX8 There are some very informative articles about quartz crystals in Bell Systems Technical Journal (on archive.org for instance) -- Poul-Henning Kamp | UNIX since Zilog Zeus

Re: [time-nuts] Optical link connects atomic clocks over 1400 km of fibre

ric fields are so much easier... One interesting thing here is that across distances like this, there would be significant longitudal currents in such a shield. Not as bad as metal spanning the Mississippi, but getting there. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.

Re: [time-nuts] 5061A Beam Current went high

and checking everything ? Try switching it to "low temp" mode if you are not already there. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adeq

Re: [time-nuts] negative mention of products (was: DIY VNA design)

hat their users write. >Some even threaten to sue, in case a negative remark is not removed >IMEDIATELY!!!1!einself >There are two ways to handle this[...] I'd say three, because I don't think "Go a head, sue me, I live in ${country_other_than_USA}." has ever failed :

Re: [time-nuts] Working with SMT parts.

ways, kicad is clearly where the party is. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained b

Re: [time-nuts] Effect of EFC noise on phase noise

gt; >Uhmm.. with 1mF in capacitors... don't you run into into microphonics problems? >Or all these capacitors supposed to be tantalum/aluminium caps? You certainly run into a separate source of temperature dependence, but of course only second order (change of temp). -- Poul-Henn

Re: [time-nuts] Effect of EFC noise on phase noise

kes, i wanted to ask whether someone >has already done this or has any references to papers? My google-foo >was not strong enough to find something. Isn't that just FM modulation ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 Free

Re: [time-nuts] Precision DACs

t disconnected the DAC during the time period when it >is at risk for glitching on code transitions. He described it >in terms of some new innovation he had invented. It seemed to >me an "obvious" (that loaded word) idea that surely must have >been used before. For insta

Re: [time-nuts] NCOCXO anyone?

nnot attenuate Vref noise. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. __

Re: [time-nuts] NCOCXO anyone?

tic chances, is to use a DDS chip which has a phase modulation register. That should get you to a nanosecond without too much trouble. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never at

Re: [time-nuts] HP5370 power supply measurements

t; fans aimed at the PC market don't do anything like that, and it would be a big mistake to use such a fan to replace the HP5370 fan, where a significant pressure is required. For attaching to the cooling fins to get some air moving, they're fine however. -- Poul-Henning Kamp |

Re: [time-nuts] HP5370 power supply measurements

and the frame must be minimized, or the pressure will leak out through it. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can

Re: [time-nuts] HP5370 power supply measurements

case the bearing is worn out and rattles. As far as I can tell it is just a Pabst 80x80x38mm axial fan with 115VAC supply, so this is going to be my attempt at replacing it: http://dk.rs-online.com/web/p/aksiale-blaesere/2119342/ -- Poul-Henning Kamp | UNIX since Zilog Z

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